As a noun terms
is .
As an adverb unusably is
in an unusable manner.
terms
English
Noun
(head)
Statistics
*
----
unusably
English
Adverb
(
en adverb)
In an unusable manner.
* 2004 , Harold McGee, On Food and Cooking
- Hydrogenation allowed manufacturers to make a butter substitute that spreads easily even at refrigerator temperature, where butter is unusably hard.